Upgrade to rails 6.1

[jrafanie]

Added to ManageIQ/manageiq#21516 (comment)

[Fryguy]

I still don't have GitHub Actions working here properly - can you run the specs manually locally?

[miq-bot]

Checked commit jrafanie@5713b18 with ruby 2.6.10, rubocop 1.28.2, haml-lint 0.35.0, and yamllint
0 files checked, 0 offenses detected
Everything looks fine. ⭐

[jrafanie]

I've manually run the tests and the only failures on mac, also fail on rails 6.0.

Failed examples:

rspec ./spec/cli_spec.rb:736 # ManageIQ::ApplianceConsole::Cli#set_replication should configure DDBB replication as standby when the required parameters are specified
rspec ./spec/cli_spec.rb:727 # ManageIQ::ApplianceConsole::Cli#set_replication should configure primary replication with a fixed database name and user when specified in the flags
rspec ./spec/cli_spec.rb:747 # ManageIQ::ApplianceConsole::Cli#set_replication should configure repmgrd when auto-failover flag is set
rspec ./spec/cli_spec.rb:718 # ManageIQ::ApplianceConsole::Cli#set_replication should configure DB as primary when the required arguments are specified